M= 4kg
v= ?
momentum = Mv
so
12kgms-¹ = 4kg×v
v= 12÷4 = 3ms-¹
Arrows point away from north and forward south, and Field lines loop around the magnet starting at the North Pole and ending at the South Pole.
I think this is the correct answer, not necessarily sure though.
The moving energy is 5,000 m/s